Paul Vincent Guilfoyle (/ˈɡɪlfɔɪl/) (born April 28, 1949) is an American television and film actor. He was a regular cast member of the CBS crime drama CSI: Crime Scene Investigation, on which he played Captain Jim Brass from 2000 to 2014. He returned for the series finale, "Immortality", in 2015. He also returned for two episodes in the sequel CSI: Vegas.

Early life
Guilfoyle was born in Boston, Massachusetts. He attended Boston College High School and spoke at the 2005 commencement of the school's seniors. He would later appear in Spotlight, which features the school. Guilfoyle graduated from Lehigh University in 1972.

He is a member of The Actors Studio and established a substantial theatrical reputation on and off Broadway, including 12 years with the Theatre Company of Boston, appearances on Broadway include in David Rabe's The Basic Training of Pavlo Hummel, Those The River Keeps, Richard III with Al Pacino, David Mamet's Glengarry Glen Ross, Death Defying Acts, and Search and Destroy.